Thread-joint for lamps.



No. 651,547. Patented June l2, I900.

' W. M. HOERLE.

THREAD JOINT FOR LAMPS.

(Application filed May 10, 1899.) (No Modal.)

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NITED STATES PATENT rrrcn.

WILLIAM M. HOERLE, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR TO THE PITTSBURGH LAMP AND BRASS COMPANY, OF PITTSBURG,

PENNSYLVANIA.

THREAD-JOINT F'OR LAMPS.

- SPECIFICATION forming part of Letters Patent No. 651,547, dated June 12, 1900.

Application filed M y 10, 1899. $erial No. 716,308. (No model.)

To aZZ whom, it may concern.-

Be it known that I, WILLIAM M. HOERLE, a resident of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Thread-Joints for Lamps; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to screw-joints for oil and like receptacles. It is a well-known fact that difficulty is experienced in any oil-receptacle, such as lamps or oil cans or reservoirs, from the seeping or leaking of the oil through the screw-joints employed either for the attachment of the burner or the spout for filling the reservoir or, in oil-cans, for the attachment of the pouring-spout. The oil seems to follow by capillary action up along the threads and finally reaches the top of the opening and oozes or seeps out through the joint and spreads over the outer surface of the can. This action often leads to injury to handsome furniture or fittings and is very objectionable. I have found that by the simple device forming the subject-matter of the present invention this difficulty can be overcome.

The invention comprises, generally stated, a joint having above the screw-threads of either member of the joint an inclosed annular recess and grooves extending across the threads or interrupting the same, as it might be termed, communicating with such annular recess, it being found that where the oil starts to follow the threads of the joint it is checked either by the grooves formed across and interrupting the threads or that it passes into the recess and passes back through such grooves into the interior of the receptacle, so that allleakage or seepage is overcome.

The particular points of invention desired to be covered will be hereinafter set forth and claimed.

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the accom panying drawings, in which-- Figure l is a vertical central section of a lamp,illustrating the invention both in connection with the threaded joint for attaching the burner and the threaded joint for the pouring-hole, the drawing showing the burnerbody and the screw-cap closing the pouringhole in full lines to more fully illustrate the invention. Fig. 2 is an enlarged view of a joint of the character described, showing the two members of the joint together and the two members separate, the upper member in full lines and the lower member in section, to more fully illustrate the invention; and Fig. 3 is an enlarged view showing the filling-opening and above the same the cap for closing it.

Like letters of reference indicate like parts in each View.

My invention may be employed with any suitable form of receptacle for oil or other semivolatile liquid, such as lamps or oilcans or oil-reservoirs, and also for tubing, where the-parts are connected by a flangejoint' 'that is, where the female part has a flange extending over the top of the male part. As the invention is illustratedin connection with a lamp, to which purpose it is particularly applicable, the lamp-body ahas formed centrally thereof the usual threaded opening I) for the attachment of the lampburner 0. Either in the threaded base d of the burner or in the threaded opening I) of the lamp-body, and preferably in both, I

form above the threaded portions an annular recess. This recess is marked 9 in the open ing b, and fin threaded base (1. Above such recess fon the threaded base cl the body of the burner extends out to form the annular flange g, which when the lamp-burner is screwed down to place rests on the top edge or shoulder h above the threaded opening I). It will be seen that in such position the annular recesses e and f coincide with each other. At suitable intervals in the threads of the opening and base are formed the grooves is, two or more of such grooves being preferably employed, though the action desired can be obtained wit-h but one such groove, and it being preferred in large joints to form grooves in the threads both of the opening I) and the base or male part d, though it is found that the joint works well and prevents leakage when such grooves are formed only in one of the members of the screw-joint. In the joint as so constructed it is found that there is no leakage or seepage of oil whatever, the action being apparently that when the oil attempts to follow around the threads it necessarily creeps in a spiral course to one of the grooves 70, which directs it downwardly into the interior again, and if any oil does succeed in passing up into the annular recess of the joint formed in either or both members thereof it seems to be unable to rise past such recess to the joint and escape at the top shoulder and the outwardlyextending flange. Whatever the action is, a joint is obtained which overcomes entirely the natural capillary action leading to seepage of the oil found in practically all lamps or oilreceptacles.

lhe invention can of course be employed with any form of oil-receptacle, whether the threaded opening is formed as part of the same, as shown in Fig. l, or whether, as in glass or like lamps, it is formed as part of a collar, as illustrated in Fig. 3, where the pouring entrance to such a lamp has a screw-plug for closing the same, as illustrated. In the making of such collars for glass or like lamps the collar is spun up into shape and may either have the recess formed therein and the interrupted thread, as illustrated in the parts shown in Fig. 1, or may be the ordinary ring usually employed, the recess and grooves being formed only in the screw-cap closing the opening. As shown in Fig. 3, this screw-cap at has the annular recess n, from which grooves 19 extend through the screw-threads, while the body of the cap forms the overhanging flange r, which rests on the top of the collar 5, which is secured by cement to the body of the lamp.

The construction illustrated can of course be applied to any screw-joints where the seepage of oil or other semivolatile liquid takes place and which are not subjected to such pressure as would force the oil into the annular recess and keep it filled and by a device which costs practically nothing and can be carried out in the spinning or stamping of the parts with but little or no millwork this difficulty always experienced in connection with oil-receptacles of the oozing or seeping out of the oil is overcome.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a joint for oil or other receptacles, the combination of two threaded joint members, one of said members having one or more grooves extending across the screw-threads thereof, and one member having a flange extending out overa shoulder on the other member, substantially as set forth.

2. In a joint for oil or other receptacles, the combination of two threaded joint members, one of said members having an inelosed annular recess formed above the screwthreads and one of said members having one or more grooves extending across the screwthreads, substantially as set forth.

3. In a joint for oil or other receptacles, the combination of two threaded joint members, one of said members having an annular recess above the threads, one member having one or more grooves extending across the screw-threads and one member having a flange extending out over a shoulder on the other member, substantially as set forth.

4. In a joint for oil or other receptacles, the combination of two threaded joint members, the threaded members each having an annular recess above the screw-threads thereof, and one of said members having one or more grooves formed across the screwthreads, substantially as set forth.

5. In a joint for oil or other receptacles, the combination of two threaded joint mem" bers, one member having a shoulder and the other a flange extending above such shoulder, and each member having an annular recess above the screw-threads and one or more grooves extending across the screw-threads, suisstantiall y as set forth.

In testimony whereof I, the said WILLIAM M. I'IOERLE, have hereunto set my hand.

WILLIAM M. HOERLE.

Witnesses:

M. RIDDELL, ROBERT C. TOTTEN. 

